因为开发需要，要把开发工具换成visual studio2015，装完之后会有警告“js”安装的问题，打开VS也没有问题，
但是一打开项目就闪退，新建项目也不行，查看应用程序日志，报错提示如下：
.NET Runtime Optimization Service (clr_optimization_v4.0.30319_32) - Failed to compile Microsoft.VisualStudio.QualityTools.UnitTestFramework, Version=10.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a because of the following error: The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040).
解决方法：
进入注册表，按Win+R运行regedit，修改下面的“Enabled”值为0就可以了
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlLsaFipsAlgorithmPolicyEnabled
坑爹